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/Author (Jonathan Mayer, Alejandro Rubio Carpio and Daniele Ragni)
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/Keywords (porous materials; turbulent boundary layer trailing edge noise; microphone array; flow resistivity)
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/Subject (The present work analyses broadband noise scattering from permeable trailing edges with identical micro-structure but under a change of temperature. Experiments are performed in an anechoic wind tunnel using a NACA0018 airfoil at chord-based Reynolds numbers between 1.88e5 and 3.14e5 and no incidence. A microphone array is used to determine far-field sound pressure level changes upon trailing edge heating. It is found that broadband noise emission can be actively controlled by varying the temperature of the porous trailing edge inserts. Specifically, the electrically heated inserts yield a noise level variation of up to 2.5 dB with the heated one being noisier compared to a baseline, unheated material with similar micro-structure. Resistivity measurements of permeable samples with varying temperature show that flow resistivity increases with the fluid temperature which is in agreement with the reported trailing edge noise increase.)
/Title (Temperature-Activated Change of Permeable Material Properties for Low-Noise Trailing Edge Applications)
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Jonathan Mayer, Alejandro Rubio Carpio and Daniele Ragni
The present work analyses broadband noise scattering from permeable trailing edges with identical micro-structure but under a change of temperature. Experiments are performed in an anechoic wind tunnel using a NACA0018 airfoil at chord-based Reynolds numbers between 1.88e5 and 3.14e5 and no incidence. A microphone array is used to determine far-field sound pressure level changes upon trailing edge heating. It is found that broadband noise emission can be actively controlled by varying the temperature of the porous trailing edge inserts. Specifically, the electrically heated inserts yield a noise level variation of up to 2.5 dB with the heated one being noisier compared to a baseline, unheated material with similar micro-structure. Resistivity measurements of permeable samples with varying temperature show that flow resistivity increases with the fluid temperature which is in agreement with the reported trailing edge noise increase.
Temperature-Activated Change of Permeable Material Properties for Low-Noise Trailing Edge Applications
2019-08-01T17:39:29+08:00
LaTeX with hyperref package
2019-08-28T16:15:52+02:00
2019-08-28T16:15:52+02:00
porous materials; turbulent boundary layer trailing edge noise; microphone array; flow resistivity
pdfTeX-1.40.18
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This is pdfTeX, Version 3.14159265-2.6-1.40.18 (TeX Live 2017/W32TeX) kpathsea version 6.2.3
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